High Engine Temperature Shutdown Activated
The MAGNUM-2 (Kubota D902 / D1105) diesel fault code means: High Engine Temperature Shutdown Activated. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- moderate
- Estimated cost
- DIY: $10-$80 for coolant, hoses, belt, or thermostat. Pro shop: $150-$600 depending on whether the root cause is debris removal and flush, a thermostat, a water pump, or head gasket work.
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Common Symptoms
- Tower shuts down completely mid-operation and will not restart until cooled
- Operator panel LED or Magnum CONNECTED controller LCD displays fault code 2
- Engine feels extremely hot to the touch near the cylinder head or radiator outlet
- Coolant overflow reservoir is bubbling or has expelled fluid onto the ground
- Radiator fins are heavily packed with chaff, dust, or debris
- Tower ran normally then began hunting or surging briefly before shutdown
- Coolant level in overflow tank is low or reservoir is dry
Probable Causes (Ranked by Likelihood)
- Radiator fins blocked by chaff, crop dust, or construction debris restricting airflow Very Likely
- Low coolant level due to slow leak, damaged hose, or failed radiator cap not holding pressure Very Likely
- Cooling fan belt slipping, broken, or missing, reducing fan speed or stopping it entirely Likely
- Thermostat stuck closed, preventing coolant from circulating through the radiator Likely
- Water pump impeller worn or shaft seal failed, reducing coolant flow rate Possible
- Tower operating in a confined or enclosed space with recirculated hot exhaust air Possible
- Coolant temperature sensor or wiring fault giving a false high-temperature reading to the controller Less Likely
Step-by-Step Diagnostic Procedure
Let the engine cool for at least 30 minutes before touching anything. Opening a pressurized hot radiator cap causes severe burns.
Inspect the radiator fins from both sides for chaff, dust, or debris packing. If clogged, blow out the fins using compressed air from the clean side outward. A garden hose works for mud. This is the single most common cause of code 2 on units working near harvest or dirt sites.
Check the coolant level in the overflow reservoir when the engine is cold. The level should be between the MIN and MAX marks. If low, top off with the correct 50/50 pre-mix antifreeze and water, then look for the source of the loss before running again.
Inspect every coolant hose for soft spots, cracks, or wet staining. Squeeze each hose, it should feel firm and springy. Check hose clamps for looseness.
Check the fan belt tension and condition. Push on the belt mid-span, it should deflect no more than about 3/8 to 1/2 inch. A glazed, cracked, or loose belt will not spin the fan fast enough to cool the radiator.
Confirm the unit has adequate clearance on all sides, at least 3 to 4 feet of open air on the radiator intake side. If the tower is backed against a wall or inside a building, recirculated heat can drive temp codes even with a clean radiator.
After correcting the physical issues above, restart and monitor the Magnum CONNECTED controller LCD temperature reading if your unit displays it. Watch for temperature climbing toward the 230 to 240 degree F range as a sign the root cause is not yet resolved.
If coolant level keeps dropping with no visible external leak, suspect a head gasket leak. That requires a combustion leak test or a shop inspection, it is beyond basic field repair.
Frequently Asked Questions
What does Magnum fault code 2 mean on a light tower?
Code 2 means the controller detected that the engine temperature exceeded its safe operating limit and triggered an automatic shutdown to prevent engine damage. On Magnum towable light towers, the most common reason is a radiator packed solid with chaff or dust, especially on units that have been working near grain harvests or dirt-moving operations.
Can the tower still run with code 2 active?
No. The controller shuts the engine down hard and will block a restart until the fault condition is cleared. You need to find and fix the cause of the overheating before the unit will come back online.
How much does it cost to fix a Magnum code 2 fault?
If the fix is just cleaning chaff off the radiator and topping off coolant, you are looking at under $20 in supplies and maybe an hour of your time. If the thermostat or a hose needs replacing, figure $50 to $150 in parts. A water pump or head gasket job at a shop can run $300 to $600 or more depending on labor rates in your area.
Why does this code keep coming back on the same tower?
Repeat code 2 faults almost always mean the root cause was not fully resolved. Common repeat offenders are a partially clogged radiator that was only blown out from one side, a cooling fan belt that slips under load, a thermostat that is starting to stick, or a slow coolant leak that keeps dropping the level. Check all four of those before calling the fault cleared.